EP0634641B1 - Dispositif pour mesurer en continu la concentration des matières en suspension d'un centrat - Google Patents
Dispositif pour mesurer en continu la concentration des matières en suspension d'un centrat Download PDFInfo
- Publication number
- EP0634641B1 EP0634641B1 EP94401471A EP94401471A EP0634641B1 EP 0634641 B1 EP0634641 B1 EP 0634641B1 EP 94401471 A EP94401471 A EP 94401471A EP 94401471 A EP94401471 A EP 94401471A EP 0634641 B1 EP0634641 B1 EP 0634641B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- enclosure
- centrifugate
- deaeration
- sample
- concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005259 measurement Methods 0.000 title claims description 15
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 230000018044 dehydration Effects 0.000 claims abstract description 3
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 3
- 238000005086 pumping Methods 0.000 claims abstract description 3
- 239000006260 foam Substances 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 5
- 241000195940 Bryophyta Species 0.000 description 3
- 235000011929 mousse Nutrition 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 244000309464 bull Species 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
- G01N15/042—Investigating sedimentation of particle suspensions by centrifuging and investigating centrifugates
Definitions
- the present invention relates to a device for measuring in continuous, reliably the concentration of suspended matter (MeS). or turbidity, centrate from a centrifuge or machine dehydration.
- the invention applies more generally to the measurement of the concentration of suspended matter in an effluent from an installation water treatment.
- the object of the present invention is to carry out the measurement of MeS, in eliminating micro-bubbles, without losing suspended matter on the sample sampled, moreover this elimination must not cause MeS flotation contained in the sample to prevent the measurement from being distorted.
- the crossing speed of the sample of the centrate in the deaeration enclosure is of the order of 0.1 to 0.5 cm / sec. and the rate of rise of the gas bubbles separated from the centrate in the deaeration chamber is of the order of 0.6 to 5 cm / sec.
- the downward speed of the water must be several times lower than that of the gas bubbles.
- the device subject to the present invention proposes to measure continuously, reliably, a sample of a centrate taken continuously at the outlet of a centrifuge.
- Figure 2 shows schematically a centrifuge 10 on which is continuously removing the centrate from an outlet pipe 12, the centrate sample thus taken being transmitted to the device 14 according to the invention so as to measure the concentration using a concentration sensor classic 16. Since this sensor is well known, it will not the subject of a description.
- Figure 1 represents the device according to the invention.
- This device 14 includes a pump 18 delivering the centrat taken from line 13 to an enclosure of deaeration 20.
- This enclosure is designed to remove the micro-bubbles contained in the sample centrate sampled, in order to carry out the concentration measurement in good conditions.
- This deaeration chamber 20 is in the form a cylindrical-conical tank in the upper part of which the centrate sample arrives tangentially. The entire sample thus taken crosses the deaeration chamber 20 in which this deaeration is carried out by natural separation of micro-bubbles contained in the centrat.
- the speed of passage of the sample centrate in the deaeration tank 20 is of the order of 0.1 to 0.5 cm / sec. and the rising speed of the micro-bubbles of gases separated from the sample is of the order of 0.6 to 5 cm / sec. So the rate of climb of these gas bubbles is at least twice the speed centrate in the deaeration enclosure.
- the deaeration chamber 20 can be provided with an agitator slow 38 allowing to mix in the mass of the centrate sample the foams likely to accumulate on the surface of this enclosure 20, allowing thus to measure the totality of suspended matter taken from the sample.
- This mechanical agitator can be replaced by means preventing the formation of foams, these means can be produced in the form of a diffusion device by sprinkling of fine water droplets, placed above the tank 20 and operating according to a determined cycle for prevent the formation and / or accumulation of foam at the surface of said enclosure.
- centrate sample is deaerated when it arrives in the conical lower zone 22 of the enclosure 20.
- the sensor could be positioned at this location.
- the sensor 16 is placed in a second enclosure 24, this for practical operating reasons.
- this sensor 16 performs the measurement of the concentration on a totally airless centrate and containing the same quantity of suspended matter, as at the time of sample.
- the centrate sample on which was performed continuous concentration measurement is eliminated to the sewer via a pipeline 26.
- the device according to the invention is always operational under optimal conditions, it is provided a periodic cleaning system.
- the purpose of this system to carry out a complete and rapid emptying of both enclosures 20 and 24, followed by cleaning of these enclosures as well as sensor 16.
- this cleaning and rinsing system comprises a supply 28 of pressurized water, this being supplied respectively by means of valves 30 and 32 to nozzles respectively 34 and 36 disposed at the top of each of the chambers 20 and 24.
- the pressurized water diffused by the rinsing nozzles 34 and 36 ensures the rinsing speakers 20 and 24 and sensor 16.
- the sensor signal is stored. The concentration measurement is automatically resumed after filling the chambers 20 and 24, the sensor signal being kept in memory also during this filling phase.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
- Centrifugal Separators (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
- un capteur de concentration (16) recevant le centrat désaéré, à partir de ladite zone inférieure conique de ladite enceinte .
- la figure 1 est une vue schématique représentant le dispositif objet de la présente invention et,
- la figure 2 représente l'implantation de ce dispositif à la sortie d'une centrifugeuse.
La mesure de la concentration est reprise automatiquement après remplissage des enceintes 20 et 24, le signal du capteur étant maintenu en mémoire également durant cette phase de remplissage.
Claims (8)
- Procédé de mesure en continu de la concentration en matières en suspension ou de la turbidité d'un centrat provenant d'une centrifugeuse ou d'une machine de déshydratation selon lequel un échantillon du centrat prélevé par pompage en continu est délivré à une enceinte de désaération caractérisé en ce que :ledit échantillon du centrat est amené tangentiellement dans la partie supérieure de ladite enceinte (20),la vitesse ascensionnelle des bulles de gaz séparées du centrat dans ladite enceinte est au moins deux fois supérieure à la vitesse du liquide admis dans l'enceinte et,la mesure de la concentration est effectuée sur un centrat totalement désaéré dont la composition est identique à celle de l'échantillon prélevé.
- Procédé selon la revendication 1 caractérisé en ce que la vitesse de traversée de l'échantillon du centrat dans l'enceinte de désaération (20) est de l'ordre de 0,1 à 0,5 cm/sec.
- Procédé selon l'une des revendications 1 ou 2 caractérisé en ce que la vitesse ascensionnelle des bulles de gaz séparées du centrat dans l'enceinte de désaération (20) est de l'ordre de 0,6 à 5 cm/sec.
- Dispositif pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 3 caractérisé en ce qu'il comporte : une enceinte de désaération (20), de forme cylindro-conique dans la partie supérieure de laquelle est délivré l'échantillon du centrat, la zone inférieure conique (22) de ladite enceinte recevant l'échantillon désaéré et,un capteur de concentration (16) recevant le centrat désaéré, à partir de ladite zone inférieure conique (22) de ladite enceinte (20).
- Dispositif selon la revendication 4 caractérisé en ce que ladite enceinte de désaération (20) est munie de moyens d'élimination des mousses réalisés sous la forme d'un agitateur lent (38).
- Dispositif selon l'une des revendications 4 ou 5 caractérisé en ce que le capteur de concentration (16), de type connu, est placé dans une seconde enceinte (24) qui reçoit le centrat à sa partie inférieure, en provenance de l'enceinte de désaération (20).
- Dispositif selon l'une quelconque des revendications 4 à 6 caractérisé en ce qu'il comporte un système de nettoyage et de rinçage rapide, et fonctionnant selon un cycle déterminé afin d'éliminer la formation et l'accumulation éventuelle des mousses à la surface de ladite enceinte.
- Dispositif selon la revendication 7 caractérisé en ce que ledit système de nettoyage rapide, périodique comporte des moyens pour assurer une vidange complète et rapide de l'enceinte de désaération (20) et de la seconde enceinte (24) contenant le capteur de concentration, et des moyens (34, 36) pour admettre de l'eau sous pression dans lesdites enceintes afin d'en assurer le rinçage, le signal du capteur étant mémorisé durant cette phase de nettoyage et de rinçage ainsi que pendant la phase de remplissage consécutive à cette phase de nettoyage.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9308707 | 1993-07-15 | ||
| FR9308707A FR2707758B1 (fr) | 1993-07-15 | 1993-07-15 | Dispositif pour mesurer en continu la concentration des matières en suspension d'un centrat. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0634641A1 EP0634641A1 (fr) | 1995-01-18 |
| EP0634641B1 true EP0634641B1 (fr) | 1998-01-28 |
Family
ID=9449272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94401471A Expired - Lifetime EP0634641B1 (fr) | 1993-07-15 | 1994-06-28 | Dispositif pour mesurer en continu la concentration des matières en suspension d'un centrat |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0634641B1 (fr) |
| AT (1) | ATE162889T1 (fr) |
| DE (1) | DE69408227T2 (fr) |
| FR (1) | FR2707758B1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290766B (zh) * | 2016-08-18 | 2019-01-01 | 黄碧琼 | 一种便于提拉又能直接显示水质的装置 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2299636A1 (fr) * | 1975-01-28 | 1976-08-27 | Traitement Eaux Cie Europ | Procede et dispositif p |
| JPS58102153A (ja) * | 1981-12-15 | 1983-06-17 | Fuji Electric Co Ltd | 水質計 |
| JPH0246107B2 (ja) * | 1982-09-27 | 1990-10-12 | Shimadzu Corp | Suishitsuodakudosokuteisochi |
| JPS59148850A (ja) * | 1983-02-16 | 1984-08-25 | Hitachi Ltd | フロ−セル |
| JPS61181939A (ja) * | 1985-02-06 | 1986-08-14 | Mitsubishi Electric Corp | 液中微粒子計測システム |
| GB9005021D0 (en) * | 1990-03-06 | 1990-05-02 | Alfa Laval Sharples Ltd | Turbidity measurement |
-
1993
- 1993-07-15 FR FR9308707A patent/FR2707758B1/fr not_active Expired - Fee Related
-
1994
- 1994-06-28 EP EP94401471A patent/EP0634641B1/fr not_active Expired - Lifetime
- 1994-06-28 AT AT94401471T patent/ATE162889T1/de not_active IP Right Cessation
- 1994-06-28 DE DE69408227T patent/DE69408227T2/de not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE69408227D1 (de) | 1998-03-05 |
| ATE162889T1 (de) | 1998-02-15 |
| FR2707758A1 (fr) | 1995-01-20 |
| FR2707758B1 (fr) | 1995-09-22 |
| DE69408227T2 (de) | 1998-05-28 |
| EP0634641A1 (fr) | 1995-01-18 |
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